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© 2012 Delmar, Cengage Learning Front-Wheel-Drive (Transaxle and CV Joint) Service Chapter 78.

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Presentation on theme: "© 2012 Delmar, Cengage Learning Front-Wheel-Drive (Transaxle and CV Joint) Service Chapter 78."— Presentation transcript:

1 © 2012 Delmar, Cengage Learning Front-Wheel-Drive (Transaxle and CV Joint) Service Chapter 78

2 © 2012 Delmar, Cengage Learning Objectives Diagnose CV joint problems Service CV joints Replace CV joint boots Disassemble and repair transaxles

3 © 2012 Delmar, Cengage Learning Introduction Removal, service, and replacement of front drive axles and constant velocity (CV) joint –Lucrative service area Transaxle removal –Relatively straightforward Once axle removal is accomplished

4 © 2012 Delmar, Cengage Learning Transaxle and Front-Wheel- Drive Service and Repair Checks of the axle assemblies –Some can be made with the axle on the car

5 © 2012 Delmar, Cengage Learning Leaking CV Joint Boot Front-wheel-drive axles –Require service as a vehicle ages –Some checks and services can be made with axle on vehicle Others require removal and disassembly of components

6 © 2012 Delmar, Cengage Learning CV Joint Boot Service Boots age over time –Repeated flexing and exposure to elements Boot fails –Grease leaks out –If not replaced: entire joint will fail –Most common problem with CV joints Replacement boot kits –Come with new clamps and correct amount of high pressure grease

7 © 2012 Delmar, Cengage Learning Axle Inspection and Diagnosis Check halfshaft for obvious looseness –Noises can be detected from the test drive –Weight must be on the suspension when checking for a noise Questions to ask customer: –What does the noise sound like? –Does it occur during acceleration, deceleration, or when turning?

8 © 2012 Delmar, Cengage Learning

9 CV Joint Diagnosis Clicking sound during a turn –Indicates bad outboard joint –Always check the splines on a shaft Bad plunge joint makes clunking sound –Starting from a stop –During deceleration –Braking Excess wear –Hard to detect visually

10 © 2012 Delmar, Cengage Learning Axle Shaft Removal Major steps –Loosen axle nut –Remove the stub shaft from the hub –Remove the stub shaft –Remove the axle –Remove snap rings and clips –Remove boot

11 © 2012 Delmar, Cengage Learning

12 CV Joint Replacement Internal circlip –Common way of retaining a fixed joint to shaft –Called knock-off-type joint –Different version used in some Japanese vehicles CV joint has been removed from axle –Boot is removed Fixed Rzeppa joints –Held to their shafts by external snap ring or internal clip

13 © 2012 Delmar, Cengage Learning Fixed Joint Disassembly and Inspection Major steps –Use drift punch to move inner race to the side for a more complete inspection Wipe the parts off and look for wear –Disassemble Rzeppa joint Mark all major components Remove the balls Wipe and lightly grease –Install the boot and joint

14 © 2012 Delmar, Cengage Learning CV Joint Boot Clamps Several types –Universal clamp –Bridge-type clamp –Earless clamp –Pressed-fit ring Installing small-end clamp –Pull big end of the boot over CV joint and install retaining clamp –Vent the small end of the boot

15 © 2012 Delmar, Cengage Learning

16 Servicing an Inner Tripod Joint Major steps –Before removing: tape shaft and joint –Cut away the clamps and boot –Check to see if tripod rollers come off of spider –Inspect condition of inside tulip –Align any marks –After boot and tripod are reinstalled: grease rollers and fill boot with rest of grease

17 © 2012 Delmar, Cengage Learning Double Offset Plunge Joints Vary in how they are connected to axle shaft –Most held by internal circlip Joint must be disassembled before it can be removed –Other kind has a circlip that can be removed by pounding on outer housing Metal retaining ring holds parts in the housing

18 © 2012 Delmar, Cengage Learning Cross Groove Joint Service and Rebuilt Halfshafts Key points –Cross groove joint is serviced in similar manner to Rzeppa joints Disassembled by turning inner race and cage perpendicular to outer cage and removing them –Complete rebuilt halfshaft is a popular repair Installing rebuilt halfshafts is often in the best interest of the customer

19 © 2012 Delmar, Cengage Learning Installing the Axle Major steps –To install a spline-type joint into transaxle: push in on axle while turning it to align splines –After inner end is installed: position stub shaft into hub as far as it can go –Do not forget to torque ball joint stud bolt –When vehicle is back on ground: torque new stub shaft nut –Check clearance of boot clamps before test- driving

20 © 2012 Delmar, Cengage Learning Transaxle Repair and Removal Key points –Transaxles used with transverse engines Differential gears are helical gears No pinion depth or backlash adjustments –Front-wheel-drive vehicles Easier to pull engine with transaxle Support the engine if it is easier to leave it in the vehicle Unbolt transaxle from engine Axles are pulled in manner previously described

21 © 2012 Delmar, Cengage Learning

22 Manual Transaxle Repair Key points –Separate halves of case on a transaxle –Check service manual for any specifics –Service and assembly are similar to RWD transmissions –End play of gears is checked with feeler gauge or dial indicator –Thrust washers, shims, or snap rings can be used to make adjustments

23 © 2012 Delmar, Cengage Learning Automatic Transaxle Repair Automatic transaxle repair –Same as RWD automatic transmissions Differences –Gar or a chain is driven by transmission output shaft to turn differential section –Automatic transaxles have a differential

24 © 2012 Delmar, Cengage Learning Transaxle Differential Side Bearing Adjustment Case halves are reassembled –Differential side bearing preload is adjusted Some use special tools

25 © 2012 Delmar, Cengage Learning Install the Transaxle Installation of transaxle is the reverse of removal sequence –After installation: be sure to check transaxle lubricant level Some have a fill plug on the side Some have a dipstick Others require removal of speedometer gear

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